In Ear Hearing Aid Mini Rechargeable Hearing Amplifier Digital Hearing Aids with Charge Case for Moderate to Severe Hearing Lo Feature: . For people with Moderate to Severe Hearing Lo. .Digital Chips made in Japan reduce background noise. .Suitable for quiet environment and noisy surroundings. . Portable charging case can charge your hearing aids whenever and wherever. .Fully charge the box for 4 hours ,it can charge your hearing aids for 15 times .Charing box can be used as storage case for hearing aid. Specifications: Material: ABS Quantity: 1pcs, 2pcs (optional) Battery: 1 * built-in battery, 1.2V, 2mAh (each pcs, included) Voltage: DC1.2V (+5%, -10%) Working current: 1.4mA Frequency response: 450-3800Hz Maximum saturation acoustic output: 128+3dB Hi-frequency average value: 108±4dB Full-on acoustic gain: 28±5dB Item size: 19 * 23 * 13.1mm / 0.75 * 0.1 * 0.52in Item weight: 3g / 0.11ounce Packing List(1pcs): 1 * Hearing Aid 1 * Charge Box 3 * Replacement Earplugs 1 * Brush 1 * USB Cable 1 * User manual OR Packing List(2pcs): 2 * Hearing Aid 1 * Charge Box 6 * Replacement Earplugs 1 * Brush 1 * USB Cable 1 * User manual